would that be possible? i saw somewhere someone use their houses ground connection through a wall socket to extend the rang of his wireless headphones, fo course this creates a huge antenna as well as noise and might disrupt the neighbors devices on the same frequency , theoretically could you make a cell phone jammer and use your mains ground as the antenna ? I am not planning to make this nor am i asking for details on how , its just an idea that came to mind

I could print the Arduino logo on a box of cereal and sell it as "Arduin-O's"

To answer the original question the answer is no .To make any kind of antenna that is in any way efficient , the antenna has to be resonant with respect to the frequency of the energy being fed into it.Most Cell phones operate on frequencies from 800 Mhz upwards.Theres no way of connecting a transmitter on these types of frequencies to any kind of random length long wire antenna and expecting the wire to radiate the energy.